<?php
//判断是否是搜索爬虫
function isSpider() {
    $agent= strtolower($_SERVER['HTTP_USER_AGENT']);
    if (!empty($agent)) {
        $spiderSite= array(
                "TencentTraveler",
                "Baiduspider+",
                "BaiduGame",
                "Googlebot",
                "msnbot",
                "Sosospider+",
                "Sogou web spider",
                "ia_archiver",
                "Yahoo! Slurp",
                "YoudaoBot",
                "Yahoo Slurp",
                "MSNBot",
                "Java (Often spam bot)",
                "BaiDuSpider",
                "Voila",
                "Yandex bot",
                "BSpider",
                "twiceler",
                "Sogou Spider",
                "Speedy Spider",
                "Google AdSense",
                "Heritrix",
                "Python-urllib",
                "Alexa (IA Archiver)",
                "Ask",
                "Exabot",
                "Custo",
                "OutfoxBot/YodaoBot",
                "yacy",
                "SurveyBot",
                "legs",
                "lwp-trivial",
                "Nutch",
                "StackRambler",
                "The web archive (IA Archiver)",
                "Perl tool",
                "MJ12bot",
                "Netcraft",
                "MSIECrawler",
                "WGet tools",
                "larbin",
                "Fish search",
        );
        foreach($spiderSite as $val) {
            $str = strtolower($val);
            if (strpos($agent, $str) !== false) {
                return true;
            }
        }
    } else {
        return false;
    }
}

/**
 * 当前路径
 * 返回指定栏目路径层级
 * @param $catid 栏目id
 * @param $symbol 栏目间隔符
 */
function catpos($catid, $symbol=' > '){
    $category_arr = array();
    $category_arr = F('category_content');
    if(!isset($category_arr[$catid])) return '';
    $pos = '';
    $siteurl = C('SITE_URL');
    $arrparentid = array_filter(explode(',', $category_arr[$catid]['arrparentid'].','.$catid));
    foreach($arrparentid as $catid) {
        $pos .= '<a href="'.getUrl($catid).'">'.$category_arr[$catid]['catname'].'</a>'.$symbol;
    }
    return $pos;
}

//前台展示的url
function getUrl($catid, $id = null){
    $categorys = F('category_content');
    if($catid && empty($id)){
        return '/'.$categorys[$catid]['catdir'];
    }elseif($catid && $id){
        return '/'.$categorys[$catid]['catdir'].'/'.$id.'.html';
    }
}

/**
 * 生成SEO
 * @param $siteid       站点ID
 * @param $catid        栏目ID
 * @param $title        标题
 * @param $description  描述
 * @param $keyword      关键词
 */
function seo($catid = '', $title = '', $description = '', $keyword = '') {
    if (!empty($title))$title = strip_tags($title);
    if (!empty($description)) $description = strip_tags($description);
//    if (!empty($keyword)) $keyword = str_replace(' ', ',', strip_tags($keyword));
    $cat = array();
    if (!empty($catid)) {
        $categorys = F('category_content');
        $cat = $categorys[$catid];
        $cat['setting'] = string2array($cat['setting']);
    }
    $seo['site_title'] = C('SITE_NAME');
    $seo['keyword'] = !empty($keyword) ? $keyword : $site['keywords'];
    $seo['description'] = isset($description) && !empty($description) ? $description : (isset($cat['setting']['meta_description']) && !empty($cat['setting']['meta_description']) ? $cat['setting']['meta_description'] : (isset($site['description']) && !empty($site['description']) ? $site['description'] : ''));
    $seo['title'] =  (isset($title) && !empty($title) ? $title.' | ' : '').(isset($cat['setting']['meta_title']) && !empty($cat['setting']['meta_title']) ? $cat['setting']['meta_title'].' | ' : (isset($cat['catname']) && !empty($cat['catname']) ? $cat['catname'].' | ' : ''));
    foreach ($seo as $k=>$v) {
        $seo[$k] = str_replace(array("\n","\r"),    '', $v);
    }
    return $seo;
}